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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4b4c0849e182be11a991fe959f3d032c97c86b25f427bc953d86519cd89d57' 
  AND token = 'WiFju5yQNXLXE2mHxezk7k55HWlXSQxOPBOBxQSO+Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}